The band - keyboardist Ed Volker, guitarists Dave Malone and Camile Baudoin, bassist Reggie Scanlon and drummer Frank Bua - formed in 1978 and have been playing together since.

Festival producer Quint Davis said that kind of longevity is worth celebrating.

"I've always been around them and a part of their journey," he said. "They're an amazing phenomenon. It's equally rare to have the same five guys playing in a band for this long and still have the unique chemistry that allows you to travel on what Ed calls 'a spirit ride.'"

Davis introduced the band Sunday evening, saying Professor Longhair and the Nevilles were the only other acts to regularly close the fest.

"We at jazz fest take our traditions as seriously as those in New Orleans," Davis said. "I thank them for giving us the times of our lives."

Camile Baudoin, foreground, and Dave Malone of The Radiators perform at the New Orleans Jazz and Heritage Festival.May 8, 2011

(AP Photo)

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Cajun fiddler Michael Doucet of BeauSoleil made a guest appearance during the farewell set as did guitarist Warren Haynes of The Allman Brothers Band and Gov't Mule. The group walked fans through all their hits including "Red Dress," "Never Let Your Fire Go Out," "Ride Me High" and "Sunshine Down."

The Radiators are calling it quits this year, with final performances set June 9-11 at New Orleans' famed music club Tipitinas.

At the festival, fans from far and wide expressed thanks for the opportunity to experience their music and regret that the music was coming to an end.

"They're what New Orleans music should be and is about," said Sean Sorenberger, of Monterey, Calif. "I thank them for educating me about New Orleans singers like Eddie Bo and Professor Longhair and bringing that sound across the country where you don't always get to hear bands like them."

"I love their energy and songwriting and their relationship with their fans," said Stacey Erdmann, of San Francisco. "I raised my daughter on this music."

Scanlon said that kind of fan loyalty is what he will miss most.

"I think that's our legacy," he said in an interview before the show. "We've been a catalyst for this amazing community of fans, who have formed around the country. These people have formed friendships that will last beyond us. These communities that have formed as a result of our music really shows that music can bring people together for more than just a gig."

Sorenberger said he planned to be at Tipitinas for the band's final shows. "It's ending so you've got to get it while you can," he said.

Though disappointed that the band was breaking up, he said he looked at it as inevitable.

"It's an end of an era for a lot of people. A lot of fans were teenagers when they first discovered The Radiators. Now they're grown, they have kids and mortgages. But that's the evolution of life."

"There's some sadness," said Erdmann, "but I wish them all the luck in the world."

Malone said he planned to take at least a month off before moving to the next musical stage of his life. What that might include is still a mystery. "Maybe something with my brother, Tommy, a guitarist with the Subdudes," he said.

Scanlon said one of his side projects - New Orleans Suspects - is scheduled to hit the road in July. "The idea of starting at the beginning again is cool and fun," he said. "Being together 33 years is like a marriage and sometimes you have to work to get that spark back. But with a new romance, you're all giddy and it's fun to have that kind of atmosphere around a new project."